Jack.



N. PREZEAU. JACK.

APPLICATION FILED IEB.21,1911'\ Patented Sept. 26, 1911.

JR Q

. description and accompanying drawings, in

UNITED sratrns PATENT OFFICE.

INAPOLEON PBEZEAU, BAKER, OREGON.

JACK.

Specification of Letters Patent. Patented Sept. 26, 1911. Applicationfiled February 21, 1911.

Serial No. 610,036.

To all whom it may concern:

Be it known that I, NAPOLEON PREZEAU, citizen of the'United States,residing at Bakercity, the county of Baker and State of Oregon haveinvented certain new and useful Improvements in Jacks, of which thefollowing ,is a specification.

This invention relates to an improved jack, and refers particularly to amachine formoving heavy objects, such as buildings, pulling stumps, orstretching wire.

The invention has for an object to provide a jack of this nature with adouble pawl mechanism for feeding the draw bar through the casing ofthejack by each movement of the lever.

The invention has for another object to so connect and mount theoperating lever as to increase, considerably, the lcvera e upon theoperating pawls so that heavy o jects'may be moved by the jack withtheapplication of comparatively little power.

The invention still further comprehends a jack which is provided with asimple relleasing means for freeing the draw bar so that the same can beextended for the purpose of acquiring a new grip upon the object beingdrawn.

For a full understanding of the invention and the merits thereof andalsoto acquire a knowledge of the details of construction, reference isto be had to the following which:

Figure'l is a perspective view of the completejack; Fig. 2 is alongitudinal central section taken vertically through the jack; and,Fig. 3 is an inner end view of the jack.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawing by the samereference characters.

Referring to the drawing the reference numerals 10 and 11 designate apair of side plates which are joined at their lower edges by a spacinbar 12. Thespacing bar 12 'is formedo a relatively thick angular barwhich projects beyond the inner ends of the plates 10 and 11 and iscurved down to form an attaching hook 13. The bar 12 extends the entirelength of the plates 10 and 11 and forms in conpmction therewith avcasing or housing for the improved mechanism.

.of the draw bar 14 is provided with a strap 17 lapping about the end ofthe draw bar and hingedly carrying a link 18 to which is attached theobject to be moved. The outer end of the casing is provided with a pairof spaced upstanding arms 19 project-' ing considerably above the edgesof the plates 10'and 11. The arms 19 are disposed in registration withone another and hingedly support 11 on a bolt 20 the lower end of theban lever 21. 'The hand lever 21 is provided upon its lower extrem itywith an edgewise oflset web 22 of circular form and which is of a widthequal to only one half of the thickness of the lever. The web 22 has itsouter face in the plane of one side of the lever while its inner face iscontinued beyond the perimeter of the web to form an interlocking fian e23. The

with an abrupt shoulder 24 fo'rmed'at the inner edge of the-web 22. Thelever 21 is connected to a link 25 which is rovided with an offset web26 having a tlhnge 27 adapted to register with and engage against theflange 23 of the web 22. The link25 is likewise provided upon itsextremity with an abrupt shoulder 28.. which is formed at the inner edgeof the web 26. The lever 21 and the link 25 are each provided withundercut arcuate grooves 29 and 30 to receive the flanges 27 and 23respectively. The undercut grooves 29 and 30 serve to hold the flanges23 and 27 against one another and offset the lateral movement of thelink 25. A rivet 31 passes loosely through the webs 22 and 26 topi'votally connect the lever and the link.

The outerend of the link 25 is provided 100 with an outwardly extendingcircular ear 32 which is apertured and adapted for engagement within thefork 33 formed rigidly upon the upper end of the rocker arm 34=.

The rocker arm 34 depends from the link 25. .105 and is hinged upon thebolt 35 at its lower lower extremity of the lever 21 is provided end,the bolt being'oarried through a pair of short arms 36 carriedagainstthe opposite sides of the casing.

A short pawl 37 is hinged upon the lower extremity of the rocker arm 34and extends inwardly and down therefrom to engage with the teeth of thedraw bar 14. A long pawl 38 is pivoted upon the rocker arm 34 at a pointabove the bolt 35 and eX- "tends inwardly and down over the short pawl37to engage with the teeth 15 of the employed in normally holding thetension arm 41 down. The inturned finger 4O rests against the upper edgeof the short pawl 37 and forces the same down upon the teeth 15.

A leaf spring 44 is carried between the plates 10'and 11 above the innerblock 16 and is hinged upon a transverse bolt 45. Theouter end of theleaf spring 44 is provided with an uptui'ned lip for the reception ofthe finger of the operator when it is desiredto swing the spring44 overout of operat ion. The spring 44 normally rests upon the upper edge ofthe long pawl 38 to hold the same down upon the teeth 15. A detachablepin 46 is engaged through the plates.

10 and 11 and across the upper face of the s ring 44 outwardly ofwthetransverse bolt- 4? to hold the spring down against the pawl 38. The pin46 is adapted to be detached from the plates when it is desiredtorelease the-spring from the pawl.

The operation of the device is apparent since when the lever 22 isvibrated'the link- 25 is moved back and, forth to reciprocate the rockerarm 34.- The outward movement of the uppenend ofthe rocker arm 34 movesthe lower or short pawl 37 inward against theadjacent tooth 15,effecting the drawing in or movement'bf the draw bar 14 through thecasing. As the. rocker arm 34 is moved in the opposite 'direction thepawl 37 is retracted to registertwith the next outer tooth of the drawbar while at the same time the upper or long pawl 38 is moved inwardagainst its adjacent tooth 15 to further carry In this manner the rockerarm 34 alternately reoiproca res the pawls 37 and 38 to effect thecontinuous feeding of. the draw bar 14 through the casing. Thetensionarm 41 re-v tains the short pawl 37 against the teeth 15 while thespring 44 holds the long pa W1 34 thc'draw bar 14 through the casing.'

against the teeth of the rack bar. \Vhen it is desired to release thedraw bar so that the same can be extended, the pin 46 is withdrawnfromthe casing and the spring 44 is raised or swung out of engagement withthe long pawl 38.

The peculiar form of the webs 22 and 26 hold the link 25 from swayinglaterally and thus reduce the frictional contact between the pivotedparts and prevents the binding of the same. The shoulders 24 and 28formed upon thehand lever and the link 25 are adapted to contact whenthelever is moved into parallelism with the-draw bar 14 so as to limit theswinging movement of the lever.

Having thus described the invention, what is claimed is:

1. A jack comprising a casing having spaced side plates a' draw barslidable through the casing and having upstanding teeth, a rocker armhinged adjacent to its' lower end between the. sidebars above the rackbar, pawls hinged upon the rocker arm at the opposite sides of thepivotal support thereof, a tension arm hinged upon'one of the sideplates and having-an inwardly extending finger projecting through theside plate and resting upon the upper side of the lower pawl, and a leafspring disposed between the side plates and engaging at its free endupon the upper edge of the upper pawl. I

2. A jack comprising a casing having side plates, a draw bar slidablethrough the casing and having rack teeth, a rocker arm hinged betweenthe side plates, upper and lower pawls hinged upon the rocker arm at theopposite sides of its pivotal support, op-

erating means for rocking the arm, a tension armhinged against one ofthe side plates and having an inturned finger pro ectlng therethroughand engaging with the lower pawl, a retractile spring carried by theside plate and engaging with the tension arm to draw the latter down,and a leaf spring carried between the side plates and engaging with theupper pawl to press the' same against the rack teeth.

3. A ack comprislng a casing having spaced slde plates, a rocker armlunged between the side plates, pawls hinge'dnpon the rocker arm, a drawbar slidable through the casing and having rack teeth cooperating-withthe pawl's, a spring arm hinged against one of the side plates andextending theretl1rough for engagement with the lower pawl, a leafspring hinged between the side plates and bearing against the upper pawlto normally hold the same against the rack teeth, and a detachable pinengaging through the side plates and against the spring to normallydepress the same against the upper pawl, said pin being adapted to beremoved whereby the spring is swung up from engagement with the pawl torelease the same from the rack.

4. A jack comprising a casing, a draw bar slid'ahle through the casingand having teeth in its upper edge, a rocker arm hinged in the casing,pawls carried 'upon the rocker arm for alternate engagement with theteeth of the rack bar, a spring operated arm carried against the side ofthe casing and having an inwardly extending finger engaging with thelower pawl, a leaf spring hinged in yieldingly hold the same downagainst the upper pawl.

In testimony whereof, I afiix my signature in presence of two witnesses.

NAPOLEON PREZEAU. [L. s.]

Witnesses L. ULLMAN, J. N. HART.

